Electric-arc lamp.



No. 844,361. PATENTED FEB. 19, 1907.

P. JANBGEK. I ELEUTRIG ARC LAMP.

APPLICATION FILED NOV. 22. 1905.

lil-

FRANZ JANEGEK, OF KARLIN, NEAR PRAGUE, AUSTRIA-HUN GARY.

ELECTRIC-ARC LAIVIP.

T No. 844,361.

Specification of Letters Patent.

Patented Feb. 19, 1907.

A lic tio fil d November 22.1905. sale No. 288.590.

To all whom, it may concern:

Be it known that I, FRANZ JANEOEK, subject of the King of Bohemia,residing at Karlin, near Prague, Bohemia, Austrian Empire,

have invented certain new and useful Improvements in Electric-Arc Lamps,of which the following is a specification.

The present invention has reference to improvements in electric-arclamps, and relates more especially to improvements in 'means forregulating the feed of the carbons and the formation of the light are;and the invention specifically consists of the construction,arrangement, and cooperation of parts, as hereinafter described, and setforth in the appended claims, reference being had to theaccompanymgdrawings, in which Figure 1 represents a view in elevation,partly 1n section, of an arc-lamp embodying my improvements; Fig. 2, aview in elevation, partly in section on a plane at right angles to thatof the sectional portion of Fig. 1 and Figs. 3 and 4 are detail views.

The two carbon rods A and B are held in the clamps a b, and the latterare slidingly arranged on the guide-rods a a and b b. The rods a for thepositive carbon A are secured above in the top plate 1 and below in thedisk 2, rigidly held in the bottom casing 3, with the result that thiscarbon rod A can only move in the direction of its longltudinal axis,while the negative carbon B, as will be described later on, can alsomove sidewise through definite range. The carbon A is provided with aseries of little pins 0, of metal or other suitable material, thelowermost of which always rests upon the cdntracted rim 5 of the ring(Z, which latter in turn rests upon the flange 4 of the casing'3, asclearly shown in Fig. 2. The ring cl can readily be rotated on its seat,while, as beforestated, the disk 2 is rigidly secured in the casing insuitable manner. It is obvious that this rotatable ring d must be ofnon-conducting apyrous material, and being above the arc does notinterfere with the projection of the light-rays. The pins 0 are of suchmaterial that the pin resting upon the rim 5 under the influence of theheat'and weight of the carbon grees gives, bending upwardly, melts, or

burns up, and thereby allows the carbon A, and with it the carbon B, toslowly descend in measure. Upon one pin leaving the rim 5 the succeedingone drops unto the rim, and the described operation repeats itself.

Upon one point of the ri1n 5 becoming by de- 1 damaged by the pins thering (1 is rotated a little distance and a new point of support of-''fered.

The guiderods .b for guiding the clamp b for the negative carbon B aresecured above to an axle 6, which is provided with leverweights 8 and journaled in cheeks 7, depending from the top plate. To this axle issecured, by means of-loop 9 and contact-screw 10, the one end of a metalband 6, which is carried over the pulleys 11 and 12 and is secured withits other end to the top plate 1 by means of loop 9 and contact-screw10. The upper pulley 11 is journaled in a rigid bearing 11, while thelower one/12, is rotatably mounted in a bracket 13, which is adjustablein height. This bracket 13 is clamped, by means of a screw 24, in acircumferential 13 on a sleeve 21, slidably mounted on a rod 22 andsecured in any position on the rod. by means of a set-screw 23. Thecollar 20 being adjusted to approximately the proper position andsecured by the screw 23, further adjustment of the height of the bracket13 may be obtained by turning the nut 20 by means of a milled collar13*, and thus adjusting the nut and bracket on the adjusted collar.

The lamp not being used, the metal band is shortest and the two carbonstouch at the lower ends. Upon current passing through the band it heatsup and stretches, allowing the axle 6 to turn under the weights 8, withthe result of spreading the carbons. The current passes in the followingdirection: terminal 14, Fig. 1, positive carbon A, negative screw 10,magnets 15 15, and terminal 14.

The suspension of the negative carbon is shown in Fig. 2. The clamp asupports a sleeve 16, also sliding on one of the guiderods (1 and havingan arm 17. The clamp 12 carries a similar arm 19, and both are connectedby means of a chain or cord 18. It is obvious that the negativeelectrode thereby enabled to followby its own weight the descent of thepositive carbon.

A lamp of the type described may be used in a continuous as well as inan alternating current circuit, inwhich latter case no selfinductionwill obtain.

WhatI claim is 1. The combination, in an electric-arc lamp of a carbon,a series of pins projecting laterally from said carbon the lower one ofB, binding-screw 10, metal band 6, binding- --whereby a new, unburnedportion of the which is rendered inoperative by the heat of the arc, andmeans for supporting the lowermost pin while it remains operative,substantially as described.

2. The combination, in an electric are lamp of a carbon, a series ofpins projecting laterally from said carbon, the lower one of which isrendered inoperative by the heat of the arc, and adjustable means forsupporting the lowermost pin while it remains operative,

supporting means may be utilized when desired, substantially asdescribed.

3. The combination, in an electric-are lamp of a carbon, a series ofpins projecting laterally from said carbon, the lower one of which isrendered inoperative by the heat of the are, a ring receiving the lowerend of the carbon, and an inner annular rim on said ring supporting thelowermost pin while it remains operative, substantially as described.

4:. The combination, in an electric-are lamp of a carbon, a series ofpins projecting laterally from said carbon, the lower one of j which isrendered. inoperative by the heat of the arc, a-ring receiving the lowerend of the carbon, and an inner annular rim on said ring supporting thelowermost pin while it remains operative, said ring and rim beingrotatably adjustable, whereby a new unburned portion thereof may beutilized when desired, substantially as described.

5. The combination, in an electricarc lamp, of two carbons arranged sideby side, a series of pins projecting laterally from one of said carbons,the lower pin being rendered in operative by the heat of the are, andmeans for supportim the lowermost pin while it re mains operative, theother resting with its point lying against the supported carbon andfeeding down with it, substantially as described.

In testimony whereof l aflix my signature in presence of two witnesses.

FRANZ JANECEK.

Witnesses: MrLosLAv HRUBY, ADoLPH Frsc'nnn.

